SQL Delete query where = sub-query

Hello,
I'm trying to delete all the rows from table A where the Acc num matches the same account number from table B.

Tried the 23 queries below but they don't want to run

Any one know how to correct them?

First Attempt
 
DELETE A.*
FROM A, B
WHERE A.ACC_NUM=B.ACC_NUM=
 
Second Attempt
 
DELETE A.*
FROM A
WHERE A.ACC_NUM=(SELECT ACC_NUM
                                    FROM B);

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ShockUKAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
use IN instead of =
DELETE A.*
FROM A
WHERE A.ACC_NUM IN (SELECT ACC_NUM
                                    FROM B);

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mnialonCommented:
DELETE
FROM A
WHERE A.ACC_NUM IN (SELECT ACC_NUM
                                    FROM B);
0
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